Decide on impermeable surface for soildrainage
Along this line, we also noted yesterday that the current Level 1&2 Plot Data for does not offer "Impervious surface" as an option for Soil Drainage, despite the existence of this new category.
MTL: We removed this option after the 2008 workshop (and added it after 2007's). See the second point 14 on this:
I'm not sure how I feel about this. When we sampled on 40-acre rock this year, we had a granite surface that was impermeable, which led to pooled water where topography prevented water flow (very poorly drained) and excessive draining where there was slope, often within the same plot. This explained why Opuntia was growing next to partially submerged vegetation. It seems impermeable surface might be valid after all.